Superconducting stacks: In search of superior superconductors

Since the discovery of superconductivity phenomena in mercury at 4.2 K in 1911, great efforts have been employed to find superconducting materials that are able to operate at room temperature. Unfortunately, in spite of the discovery of different superconductors, at present, the so-called high-temperature superconductors (HTSC) maintain their superconducting behavior only a little above liquid nitrogen temperature (77 K).